Abstract

Field experiments were conducted in black soils of Tamil Nadu Agricultural University Farm during kharif 1982 and 1983. Black gram Var, T9 was raised impo- sing different herbicide treatments comparing with farmers practice of two hand weedings at 15th and 35th day after sowing and unweeded control, The nutrient. removal by weeds was enormous when compared to crop uptake in the initial stage. Herbicide application in general and application of isoproturon 0.5 kg ha-1 in particular reduced the nutrient removal by weeds and enhanced the nutrient uptake by the crop. The nutrient uptake in grain and stover was the highest in treatment with pendimethalin 1.0 kg ha-1 followed by the treatment with isoproturon 0,5 kg ha-1. The crude protein content of grain was the highest in treatment with pendimetha- lin 1.0 kg ha-1 but were on par with other treatments. Significant increase in crude protein production was recorded with pendimethalin application at 1.0 kg ha-1.

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